It's illegal to drop out of school before the point in time where you cover algebra and basic history. If you can't answer basic questions about those topics by age 16, you're either intentionally refusing to learn, or have mental problems that would have prevented you from getting a high IQ score in any case.

sub-Saharan Africans did not have much culture to begin with and, like with the Mayans and Aztecs, I would attribute this to a lack of strife.

What the fuck are you smoking? Aztecs and Mayans had richly developed culture, they just lost most of it when the Spanish sacked their cities and burned their records. They also had frequent wars with themselves and other contemporary civilizations.

Jews and Asians also have much higher average IQs and test scores than certain other minority groups, which both correlate very well with earnings in the 21st century. If you can't use your brain for anything other than a hat rack, you don't have a prayer in hell of staving off automation forever.

Also your examples of the oppressions of the Jewish, Japanese, and Irish people is an extremely shaky argument. None of these oppressions were like slavery (except for a brief period of Irish oppression).

Jews were openly persecuted in all Christian countries from the fall of Rome to 1945 AD, roughly five times the length of the African slave trade, and that's not counting various terrible shit happening in antiquity, like Israel being repeatedly conquered by the Babylonians, Egyptians, Greeks, and Romans. This isolation caused dangerous genetic bottlenecks, which is why Ashkenazis in the US so often have children with non-Jews, preserving the intelligence of the offspring while preventing the spread of Tay-Sachs and other genetic nasties. One of the biggest Jewish holidays, Pesach (Passover) is specifically about celebrating freedom and includes ritual promises to free the enslaved. The Irish were treated badly almost to the point of genocide by the English for over 800 years, almost three times the length of the African slave trade, after being raped and pillaged into submission by Danish vikings in the middle ages.

Slavery in colonial America is simply incomparable to nearly any other form of oppression and is distinguished not by its cruelty or horror, but by its ability to literally form the entire ethos of the oppressed subject.

That would be because blacks didn't have a preexisting culture to preserve, and were dumb enough to go along with whatever got drilled into their tiny brains.

It's easy to imagine that generations upon generations of people unable to form more than a handful of complex thoughts would lead to a default state of stupidity for the typical black man in America. (emphasis mine)

You're confusing cause and effect here. The brainwashing and slave mentality only worked because blacks started off retarded (the dropping of the "mentally retarded" threshold from IQ 85 to IQ 70 was entirely political), and were then bred for strength and docility like farm animals for over a century.

Theoretically yes, in practice any permanent divergence from Linus's tree starts bit rotting within a month and ends up yet another abandoned vendor BSP or similar. Even Google decided it was less work to get the Android kernel changes merged back upstream.